Update from the discord channel - the hardfork has been postponed to block 170000. The developers are working very hard to fix a wallet issue on the Mac wallet. They are very wise to postpone the hardfork just a little longer to make sure that everything is working as expected prior to SIN launch.

Also, I learned that for all of us with SUQA that is timelocked, after the hardfork, the SUQA coins will be seen as immature in the new sin wallet. Also once the timelocks reach their enddate, they will become available as SIN. No need to send from old wallet to new wallet.

Hope this helps someone else out!